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Issue 16, 1997

Fluorine-atom initiated oxidation of CF3CF2H (HFC-125) studied by FTIR spectroscopy: product yields and kinetic modelling

Abstract

A comprehensive study has been carried out of the oxidation of CF 3 CF 2 H (HFC-125). Reaction was initiated by continuous photolysis of F 2 in the near-UV. The F atoms produced abstracted a hydrogen atom from CF 3 CF 2 H initiating oxidation in gas mixtures containing variable amounts of O 2 and made up to a total pressure of 700 Torr with N 2 . Product yields were measured as a function of time using FTIR spectroscopy. Experiments were performed at room temperature and in mixtures containing different ratios of [F 2 ] to [CF 3 CF 2 H]. The major products were COF 2 , CF 3 O 3 CF 3 and CF 3 O 3 C 2 F 5 , consistent with C–C bond scission being the dominant loss process for CF 3 CF 2 O radicals and with previous studies which used chlorine atoms toinitiate oxidation. Attempts to match the experimental results with predictions using the FACSIMILE chemical modelling pro-gram were moderately successful and confirmed recent results regarding the equilibrium constant for: F+O 2 (+M)=FO 2 (+M).

Article information


J. Chem. Soc., Faraday Trans., 1997,93, 2693-2699
Article type
Paper

Fluorine-atom initiated oxidation of CF3CF2H (HFC-125) studied by FTIR spectroscopy: product yields and kinetic modelling

A. S. Hasson, C. M. Moore and I. W. M. Smith, J. Chem. Soc., Faraday Trans., 1997, 93, 2693 DOI: 10.1039/A702105D

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